fcron is aperiodicalcommandscheduler whichaims atreplacing VixieCron, so itimplements mostof itsfunctionalities. But fcronmakes noassumptions onwhether yoursystem isrunning all thetime orregularly : youcan, forinstance, tellfcron toexecute tasksevery x hours yminutes ofsystem up timeor to do a jobonly once in aspecifiedinterval oftime. Fcronhas also muchmorefunctionalities: you can alsoset a nicevalue to a job,run itdepending onthe system loadaverage and m